feat: import library for downloadable config

[shazron]

Description

Import library for the downloadable config from Adobe I/O Console. To be used with the app:use and app:create commands, via the --import flag.

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

Merging #116 into master will increase coverage by 1.67%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #116      +/-   ##
==========================================
+ Coverage    87.4%   89.07%   +1.67%     
==========================================
  Files          10       11       +1     
  Lines         254      293      +39     
  Branches       37       39       +2     
==========================================
+ Hits          222      261      +39     
  Misses         28       28              
  Partials        4        4

Impacted Files	Coverage Δ
src/lib/import.js	100% <100%> (ø)

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[shazron]

todo: need to encode any key names that have underscores with double underscores